Plug the RCA end of the cable into the audio output jacks on the turntable. Plug the 1/8-inch plug into the "Line In" jack on your computer's sound card.
Click the "Start" menu button, then click "Control Panel." Click "Hardware and Sound," then "Sound." Click the "Recording" tab, click "Line In" and click the "Set Default" button.
Click the "Start" menu button and type "sound recorder" into the "Search" box. Press "Enter" to open Sound Recorder.
Play the record on the turntable. Immediately after starting the record, click the "Start Recording" button in Sound Recorder.
Click "Stop Recording" when the record finishes playing. Type a name for the audio file into the "File name" box and click "Save." Repeat the process for the other side of the record.